Fix tests: "infix modifier required" and "operator modifier required" errors

idea/testData/quickfix/createFromUsage/createFunction/set/createSetFromUsage1.kt

@@ -1,4 +1,6 @@
 // "Create member function 'set'" "true"
+// ERROR: operator modifier is required on 'set' in 'Foo'
+
 class Foo<T> {
     fun <T> x (y: Foo<List<T>>, w: java.util.ArrayList<T>) {
         y<caret>["", w] = w

idea/testData/quickfix/createFromUsage/createFunction/set/createSetFromUsage1.kt.after

@@ -1,4 +1,6 @@
 // "Create member function 'set'" "true"
+// ERROR: operator modifier is required on 'set' in 'Foo'
+
 class Foo<T> {
     fun <T> x (y: Foo<List<T>>, w: java.util.ArrayList<T>) {
         y["", w] = w

idea/testData/quickfix/createFromUsage/createFunction/set/createSetFromUsage2.kt

@@ -1,4 +1,5 @@
 // "Create extension function 'set'" "true"
+// ERROR: operator modifier is required on 'set' in ''
 
 class Foo<T> {
     fun <T> x (y: Any, w: java.util.ArrayList<T>) {

idea/testData/quickfix/createFromUsage/createFunction/set/createSetFromUsage2.kt.after

@@ -1,6 +1,7 @@
 import java.util.ArrayList
 
 // "Create extension function 'set'" "true"
+// ERROR: operator modifier is required on 'set' in ''
 
 class Foo<T> {
     fun <T> x (y: Any, w: java.util.ArrayList<T>) {

idea/testData/quickfix/createFromUsage/createFunction/set/setterForIncrement.kt

@@ -1,6 +1,6 @@
 // "Create member function 'set'" "true"
 class A {
-    fun get(s: String): Int = 1
+    operator fun get(s: String): Int = 1
 }
 
 fun foo() {

idea/testData/quickfix/createFromUsage/createFunction/set/setterForIncrement.kt.after

@@ -1,6 +1,6 @@
 // "Create member function 'set'" "true"
 class A {
-    fun get(s: String): Int = 1
+    operator fun get(s: String): Int = 1
 
     operator fun set(s: String, value: Int) {
         throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.